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VRRP: Increasing Reliability and Failover with the Virtual Router Redundance Protocol by Adnan Adam Onart, Ayikudy Srikanth

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5.2. VRRP and Learning Bridges

Since VRRP uses a virtual MAC address, it is important to take a closer look at the functionality of VRRP in the presence of an Ethernet learning bridge.

In a bridged network, the master and backup routers are generally kept on different bridge segments to avoid a single point of failure that would cause all the hosts that depended on the routers to be stranded if that bridge port were to fail. Figure 5-2 illustrates this issue.

Figure 5-2. VRRP routers on same bridge segment

In Figure 5-2, routers R1 and R2 belong to VRID 37; R1 is the master and R2 is the backup. They are on the same bridge port A. Hosts H1 and ...

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